Just as the title says really.
DS is off to university very soon but doesn't drink alcohol. It's just never interested him.
He only ever drinks water, black currant juice ie Ribena etc, milk or milkshakes 
He's really conscious of the partying side of uni and although he's pretty sociable, he's worried about looking like a numpty while everyone else is getting wasted having a good time.
His friend suggested dark berry cider as it's supposedly 'like drinking Ribena' and so we bought him some yesterday to try before he gets there. Except that I forgot to tell him it was fizzy and he doesn't drink fizzy drinks either! (Trust me, he's not fussy about anything else, just what he drinks!) Although he is an odd boy as he never liked sweets either. He could eat his body weight in chocolate though 
It all stems from him not tolerating fruit as a toddler and I think it put him off anything 'fruity' (except black currant obviously).
So my question is, can anyone suggest anything that he might quite like to drink?
I suggested he just be himself and say he doesn't like drinking but he's worried he's going to feel left out etc.
Please help!!!